Cylinder and guide construction for hammer-drills



L. C. BAYLES AND F. M. SLATER.

CYLINDER AND GUIDE CONSTRUCTION FOR HAMMER DRILLS. APPLICATION FILED sEPLIQ. IsIa.

1,304,442! Ptented May 20, 1919 INVENTORS.

B) I ATTORN Y UNITED STATES PATENT OFFICE.

LEWIS C. BAYLES AND FRED M,

SLATER, or nAs'roN, PENNSYLVANIA, ASSIGNORS 'ro INGEBSOLIi-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

CYLINDER AND GUIDE CONSTRUCTION FOR HAMMER-DRILLS.

To all whom it may concern Be it known that we, LEWIS C. BAYLES and FREuMp'SLATER, both citizens of the United States, residing at Easton, 1n the county of Northampton and State of Pennsylvania, have invented a certain new and useful Improvement in Cylinder and Guide Constructions for Hammer-Drills, ofwhich the following is a specification.

This invention relates to hammer and rock drills and in particular toa construction of cylinder and guide member for drills of this type. Y

The objects of the present invention areto provide a hammer drill cylinder and sepa- Further, to provide the guide member which may be securely attached to the cylinder but which is also easily removed when Worn considerably in the flanges where they slide in the shell and where they are sub ject to the greatest strain and wear.

With these and other objects in view this invention consists in the features of construction and operation set forth in the following specification and illustrated in the drawings annexed hereto and forming a part hereof, in which:

Figure 1 shows a longitudinal view of the cylinder and guide, a part being broken away and showing portions of the construction in section.

Fig. 2, a cross sectional view taken on the line22 of Fig. 1; and

Fig. 3, a perspective showing the complete construction of cylinder guide and shell.

Referring more particularly to the figures of. the drawing, the cylinder is shown made in two sections, but it is obvious that this may be varied and the cylinder made of but one part. In the cylinder selected for illustration 1 refers to the rear section of the cylinder and 2 the front section. These are provided with a bushing 3 extending into both sections, serving to hold both sections in alinement. With the cylinder made of one piece this bushing member 3 would be omitted and the cylinder would be ground and hardened in the usual manner,

but with the two-part cylinder construction v Specificationof Letters Patent. Patented May 20-, 1919, Application filed September 19,1918. Serial No. 254,782. I

nowearing parts. Each of the cylinder se tions 1 and 2 is provided with a dovetailed portion 4. extendinga'long its lower edge. A guideinember 5 extends longitudinally of the cylinder sections 1 and 2 and is pro} vided with portionsb engaging the dovetailed portions and is also provided with parallel guiding flanges toneither side adapted to engage the guideways 7 of a shell 8 in which the cylinderandguideis adapted to slide. The guide '5 would be made in the same manner with a one-piece cylinder, and in that case the cylinder would be provided with a continuous dovetailed portion extending throughout its length.

Depending from the rear of the rear cylinder portion 1 or from the rear end of the cylinder in the case of a, one-piece cylinder, is a lug 9 having a hole 10 bored longitudinally of the cylinder. The guide member 5 is also provided at its rear end with a depending lug 11 having a hole 12 in alinement with the hole 10 provided in the cylinder portion 1. A feed nut 13 having a head 14 passes through theholes 10 and 12 and serves to hold the guide member 5 and rear cylinder portion 1 in alinement and by means of a nut 15 threaded upon the feed nut 13 the parts are held firmly together. The usual feed screw 16 passes through a threaded hole provided in the feed nut 13 by means of which the drill is advancedv to the work. The drill is provided also with the usual side rods 1 9extending longitudinally of the drill cylinder by means of which the cylinder partsv are held firmly together.

From the above it will be seen that a drill has been provided having a cylinder formed of two parts in the form of the'invention illustrated, held together in the usual manner by means of side rods and also held in alinement with each other by means of a guide member engaging the cylinder parts throughout their length, the .entire ,construction, that is, the two cylinder parts and the guide member being slidably mounted in a shell member and the rear cylinder member and guide member being held firmly together by means of lugs provided on each whereby they engage and are secured together by means of the feed nut.

It is to be understood that the present showing and description disclose only one specific embodiment of the present invention and that other forms and modifications are included within the spirit and scope of the invention, as expressed in the appended claims.

lVhat we claim is:

1. In a cylinder and guide construction for hammer drills, a cylinder having portions engaging a guide throughout its length said guide attached to said cylinder at one end whereby said cylinder and guide are held rigidly together.

2. In a cylinder and guide construction for hammer drills, a cylinder comprising a plurality of parts each having portions engaging a guide, said guide attached to one of the parts of the cylinder and holding said cylinder parts and guide in alinement with each other.

3. In a cylinder and guide construction for hammer drills,-a cylinder, a guide member engaging said cylinder throughout its length whereby said cylinder and guide are held rigidly together said guide member being provided with flanges adapted to engage guideways provided in a shell in which the drill may be slidably mounted.

4:. In a cylinder and guide construction for hammer drills, a cylinder comprising a portions in alinement and provided with flanges adapted to engage guideways provided in a shell in which slidably mounted. H

5. In a cylinder and guide construction for hammer drills, a cylinder, a dovetailed portion-onthe lower surface of said cylinder, a guide member extending the full length of said cylinder and having portions engaging said cylinder dovetailed portion, said guide member'being rigidly attached to the rear portion of the cylinder. 7 6. In a cylinderand guide construction for hammerdrills, acylinder comprising a front and rear portion in alinement with each other, said portions having dovetailed portions on their lower surfaces, a guide member extending the. full length of said cylinder and having portions engaging said cylinder dovetailed portions, said guide being rigidly attached to the rear portion of the cylinder. i

In testimony whereof, we have hereunto set our hands; I LEWIS C. BAYLES. FRED. M. SLATER.

the drill may be Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,-

Washington, I), 0." 

